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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        //模拟获取   用户数据    订单数据   商品数据
        function getUsers(){
            setTimeout(()=>{
                let data='用户数据';
                //调用next()  方法，并且将数据传入
                iterator.next(data);

            },1000);
        }

        function getOrders(){
            setTimeout(()=>{
                let data='订单数据'; 
                iterator.next(data);
            },1000);
        }

        function getOrders(){
            setTimeout(()=>{
                let data='商品数据'; 
                iterator.next(data);
            },1000);
        }

        function * gen(){
            let users=yield getUsers();
            console.log(users);
            let orders=yield getOrders();
            console.log(orders);
            let goods=yield getOrders();
            console.log(goods);
        }
        
        let iterator=gen();
        iterator.next();



        //不能直接调用
        // getUsers();
        // getOrders();
        // getOrders();
    </script>
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<body>
    
</body>
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